我怎样才能继续if和else语句？

Question

我正在尝试创建一个应用程序，每按一次按钮，就会出现一个新的美国州，到目前为止，我已经到了阿拉斯加，不知道如何继续。这是我到目前为止制作的代码：

- (IBAction)button1:(id)sender {

if([hellolabel.text isEqualToString:@"Alabama"])
{

hellolabel.text = @"Alaska";

}

else

{

hellolabel.text = @"Alabama";

}

}

Answer 1

将所有州名存储在数组中

  NSArray *states = @[@"Alabama",@"Alaska",...]

- (IBAction)button1:(id)sender 
 {
   NSString *state = [states objectAtIndex:arc4random_uniform(states.count)];
   hellolabel.text = state;
 }

这将为您提供随机状态名称

如果您想订购

@interface ViewController : UIViewController
{
   NSArray *_states;
}

 - (void)viewDidLoad
 {
  [super viewDidLoad];
   _states = @[@"Albama",@"Alaska"];
 }
- (IBAction)button1:(id)sender 
 {
    static NSInteger position = 0;
    if(position == _states.count-1)
    {
     position = 0;
    }
    else
    {
      position++;
    }
   NSString *state = [_states objectAtIndex:position];
   hellolabel.text = state;
 }